diff --git a/internal/datanode/channel_meta.go b/internal/datanode/channel_meta.go
index 716aa3fafb45c..f33ef8b48e95c 100644
--- a/internal/datanode/channel_meta.go
+++ b/internal/datanode/channel_meta.go
@@ -595,10 +595,11 @@ func (c *ChannelMeta) updateSegmentRowNumber(segID UniqueID, numRows int64) {
 	c.segMu.Lock()
 	defer c.segMu.Unlock()
 
-	log.Info("updating segment num row", zap.Int64("segmentID", segID), zap.Int64("numRows", numRows))
 	seg, ok := c.segments[segID]
 	if ok && seg.notFlushed() {
 		seg.numRows += numRows
+		log.Info("updated segment num row", zap.Int64("segmentID", segID),
+			zap.Int64("addedNumRows", numRows), zap.Int64("numRowsSum", seg.numRows))
 		return
 	}
 
@@ -620,11 +621,11 @@ func (c *ChannelMeta) updateSingleSegmentMemorySize(segID UniqueID) {
 	memorySize := c.calculateSegmentMemorySize(segID)
 	c.segMu.Lock()
 	defer c.segMu.Unlock()
-	log.Info("updating segment memorySize", zap.Int64("segmentID", segID),
-		zap.Int64("memorySize", memorySize))
 	seg, ok := c.segments[segID]
 	if ok {
 		seg.memorySize = memorySize
+		log.Info("updated segment memorySize", zap.Int64("segmentID", segID),
+			zap.Int64("memorySize", seg.memorySize))
 		return
 	}
 
diff --git a/internal/datanode/flow_graph_insert_buffer_node.go b/internal/datanode/flow_graph_insert_buffer_node.go
index 0b96253bf6b26..76c177289ddbd 100644
--- a/internal/datanode/flow_graph_insert_buffer_node.go
+++ b/internal/datanode/flow_graph_insert_buffer_node.go
@@ -463,17 +463,17 @@ func (ibNode *insertBufferNode) Sync(fgMsg *flowGraphMsg, seg2Upload []UniqueID,
 			zap.Any("position", endPosition),
 			zap.String("channel", ibNode.channelName),
 		)
-		// check if task pool is full
-		if !task.dropped && !task.flushed && ibNode.flushManager.isFull() {
-			log.RatedWarn(10, "task pool is full, skip it")
-			continue
-		}
 		// check if segment is syncing
 		segment := ibNode.channel.getSegment(task.segmentID)
 		if !task.dropped && !task.flushed && segment.isSyncing() {
 			log.RatedInfo(10, "segment is syncing, skip it")
 			continue
 		}
+		// check if task pool is full
+		if !task.dropped && !task.flushed && ibNode.flushManager.isFull() {
+			log.RatedWarn(10, "task pool is full, skip it")
+			continue
+		}
 		segment.setSyncing(true)
 		log.Info("insertBufferNode start syncing bufferData")
 		// use the flushed pk stats to take current stat
diff --git a/internal/datanode/flow_graph_manager.go b/internal/datanode/flow_graph_manager.go
index 0e5da3f371d29..0309eeaaf8b9a 100644
--- a/internal/datanode/flow_graph_manager.go
+++ b/internal/datanode/flow_graph_manager.go
@@ -91,7 +91,12 @@ func (fm *flowgraphManager) execute(totalMemory uint64) {
 		return
 	}
 
-	if float64(total) < float64(totalMemory)*Params.DataNodeCfg.MemoryWatermark.GetAsFloat() {
+	memoryWatermark := float64(totalMemory) * Params.DataNodeCfg.MemoryWatermark.GetAsFloat()
+	if float64(total) < memoryWatermark {
+		log.RatedDebug(5, "skip force sync because memory level is not high enough",
+			zap.Float64("current_total_memory_usage", float64(total)),
+			zap.Float64("current_memory_watermark", memoryWatermark),
+			zap.Any("channel_memory_usages", channels))
 		return
 	}